Abstract: A printer assembly for printing on a supply of media traveling in a media direction. The printer generally includes a platen assembly, a print head assembly and a pivot member. The pivot member provides for pivoting of the print head assembly relative to the platen assembly to adjust for variations in the media as it passes therebetween. Advantageously, the pivot member may be supported directly by the platen assembly, such as by bearing supports of the platen assembly, to reduce positioning error from intervening components. Preferably, the pivot member is positioned upstream of the print head assembly. Also, a pair of pivot members may each be supported at the ends of an angulation arm which is coupled to the print head assembly for angulation in the media direction but is uncoupled in the cross-media direction.

Abstract: A rack and pinion medium roll support includes a support holder, a generally circular shape support shaft perpendicularly coupled to the support holder, and a rack and pinion mechanism, said rack and pinion mechanism comprising a pinion rotatably coupled to the support holder, an inner adjustable lever having an inner toothed rack meshed with the pinion, and an outer adjustable lever having an outer toothed rack meshed with the pinion at diametrically opposite end of the inner toothed rack of the inner adjustable lever, the inner adjustable lever being slidably coupled to the support shaft at an inner end and the outer adjustable lever being slidably coupled to the support shaft at an outer end, wherein the pinion is adapted to move the inner adjustable lever and the outer adjustable lever with approximately equal distance relative to each other for center adjusting a medium roll mounted on the support shaft between the inner adjustable lever and the outer adjustable lever.